Originally Posted by
cxwrench
If you don't over-inflate them. 85 in that tire is about the same as 100 in a 23mm tire. I weigh about 165 and would inflated a 28 tubular between 60-70.
I'm using the Silca Pro tyre pressure calculator
https://silca.cc/pages/sppc-form
Mainly because it has a setting for surface conditions which includes "worn pavement / some cracks" which I'm guessing is about right for London streets.
I also tried 3 others and it roughly agrees.
I'm 192 lbs which gives 74/76 psi.